Advisory Service Workbooks on architectural elements of historic New England houses and gardens, amply illustrated
Historic American Buildings Survey (HABS) drawings of The Portland Observatory
Information on historical and preservation groups
Information on National Register of Historic Places (also online)
Extensive collection of photographs and slides
Vertical files by subject
John Pancoast Collection
John Pancoast was an architectural historian who collected information on Portland houses, architects, prominent Portland residents, artists and craftsmen, and area towns; his files were a generous bequest to the Library.